sacramental

of, relating to, or of the nature of a sacrament, especially the sacrament of the Eucharist.

2.

powerfully binding:

a sacramental obligation.

noun

3.

Roman Catholic Church. an action, as the sign of the cross, a ceremony resembling a sacrament, or a sacred object, regarded as being instituted by the church rather than by Christ and serving as a means of receiving sanctifying grace.